Pulley.



A. W. NELSON.

PULLEY.

APPLICATION FILED mums. 1909v Patented Aug. 6, 1912.

ll ffnesses ig 4% TED STATES P TENT ARTHUR W. NELSON, OI? GHICAGQ, ILLINOIS.

PULLEY.

Specification of Letters lgatent.

.Patmted sane, tare.

Application filed June 26, .1909. Serial No. 504,523.

To all whom it may concern;

Be it lmown that I, ARTHUR WlNnLsoN, a citizen of the United States of America,

residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pulleys, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates particularly to a tractional surface or covering for pulleys, preferably of yielding material, whereby the maximum driving power for the belt may be secured with a minimum tension and less friction on the bearings.

tractional facing, inits novel and simple construction, in retainin means for uniting the facing to the perip cry of the pulley, and still further in various details or construction as will be more fully hereinafter set forth[ In the drawings,--I*igure l is an elevation of a pulley, with my improved covering or tractional facing a plied; Fig. 2 is a vertical central section t erethrough; Fig. 3 is a sectional perspective view of a modified form of pulley, with the covering removed;

and Fig. 4 is a erspective view of a section of the preferre form of traction facing.

In the drawings thus briefly described, A

designates a pulley of any approved type, B

the shaft on which it is suitably mounted,

and C the tractional facing, the latter in its preferred form consisting of a series of ring-shaped sections D formed preferably of leather or other suitable relatively iel ing material. The surface sections re erred to are preferably formed each of a stripv of leather, bent into circular form, as shown in Fig. 4, and having an annular groove E formed in its peripher substantiall midway of its edges, in w ich is loca a retainer F in the form preferably of a metal ring, the groove being sufiiciently deep when the section is in place. to position the ring below the section surface, so as to be out of contact vwith the belt. The surface sections beingthus formed, they are placed upon the pulley in the manner indicated in Fig. 2,

' having preferably a driving fit thereon,

which causes the retainers to tightly clamp the sections in place. In the figure last referred to, I have shown the ulley' as of the crown, type, the periphery taperin from the center to each end or edge and t es tions being correspondingly tapered so as to fit the surface. I may'and preferably'do ferential movement. .,The invention consists in a removable A tractional facing of the character de scribed provides the additional driving power desired, and at the same time can beconveniently made and applied and cheaply manufactured. I have shown the desired form of tractional facing, consisting of a series of independent annular sections, but I wish it understood that I do notdesire to be limited to this particular form, as. various modifications may be made without in ,any manner departing from the spirit of my invention.

What I claim as my invention is,-

1. The combination with a pulley having a series of equi-, distant transverse ribs formed on the periphery thereof, of a removable traction facing consisting of a plurality of narrow annular bands, each having a like series of transverse scores formed on their inner. faces for engagement with the ribs and having their outer faces centrally grooved circumferentially thereabout, and a retainin ring for each band seated and'held within t e groove, said annular bands being adapted to have a driving fit with the periphery of the pulley.

2. The combmation with a pulley, of a removable traction facing therefor consisting of a plurality of narrow annular bands centrally grooved circumferentially thereabout, and a clamping ring for each band seated within the groove, said annular bands being adapted't'o have a driving fit with the periphery of the pulley and clamped thereto solely through t e medium of the clampmg rlng.

3. The combination with a ulley having transverse ribs formed In t e perlphery thereof, of a removable traction facing consisting of a plurality of narrow annular bands, each having a transverse score f0 m1:-

on its inner face for engagement with the In testimony whereof I afiix my signature ribs ani havi their fiutei1 face; centrslly in presence of two witnesses.

groove eircum erentia t erea out an a retainin ring for each bind seated and held ARTHUR NELSON within t e groove, said annular bands being Witnesses: adapted. to have a driving fit with the -pe- O IVER L. DAVIS, riphery of the pulley. Roy H. MCLEAN.

copies of this patent may be obtained for in abut: each, by addi'easing the commissioner of Patentl,

Washington, 1050; 

